<mat-form-field class="full-width">
  <input matInput placeholder="在这里快速新建一个任务" [(ngModel)]="desc" name="desc" type="text" required>
  <button mat-icon-button matSuffix type="submit" (click)="sendQuickTask()">
    <mat-icon>send</mat-icon>
  </button>
  <mat-error>不能为空</mat-error>
</mat-form-field>